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B4C/SiC functional gradient ceramic and manufacturing method thereof

A functional gradient and ceramic technology, applied to the structure of armor plates, etc., can solve the problems of reduced hardness of ceramics and weakened anti-ballistic performance

Inactive Publication Date: 2011-09-07
李汶军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, it was found that due to the introduction of SiC, the B 4 The hardness of C ceramics is reduced, and the anti-ballistic performance is weakened

Method used

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  • B4C/SiC functional gradient ceramic and manufacturing method thereof
  • B4C/SiC functional gradient ceramic and manufacturing method thereof
  • B4C/SiC functional gradient ceramic and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 20-24% VB at a content of 5-10mol% 2 / 40-48%B 4 In the presence of C / 30-36mol% SiC eutectic composite powder additives, the flat plate structure B is hot-pressed and sintered at 1900-2000°C and 30-40MPa. 4 C / SiC functionally graded materials. The structure in the thickness direction is as figure 1 , where B 4 C layer thickness is 40-60mm, SiC layer thickness is 20-30mm, B 4 The gradient layer thickness between C and SiC is 20-30 mm. SEM analysis showed that: Surface B 4 Layer C is denser and has no obvious holes, such as image 3 , a small number of holes appear in the bottom SiC layer, such as Figure 4 . The mechanical performance test shows that: the surface layer B 4 The hardness of layer C is 33-36GPa, and the bending strength of the material is 600-650MPa. The detailed data are shown in Table 1.

[0037] Table 1 SiC / B 4 Sintering conditions and performance comparison of C ceramics

[0038]

Embodiment 2

[0040] 10-20% VB at a content of 4-9mol% 2 / 25-35%B 4 C / 15-25%LaB 6 / 30-40mol% SiC eutectic composite powder In the presence of additives, the flat plate structure B 4 C / SiC functionally graded materials. The structure in the thickness direction is as figure 1 , where B 4 C layer thickness is 40-60mm, SiC layer thickness is 20-30mm, B 4 The gradient layer thickness between C and SiC is 20-30mm. SEM analysis showed that: Surface B 4 Layer C is denser and has no obvious holes, such as Figure 5 , while a small number of holes appear in the bottom SiC layer, such as Figure 6 . The mechanical performance test shows that: the surface layer B 4 The hardness of layer C is 31-34GPa, and the flexural strength of the material is 500-600MPa. The detailed data are shown in Table 1.

Embodiment 3

[0042] 18-22%VC (or VN) / 46-54%B at 5-10mol% 4 In the presence of C / 26-34mol% SiC eutectic composite powder additives, the isomeric structure of B is sintered at 1900-2000 ° C and 30-40 MPa 4 C / SiC functionally graded materials. The structure in the thickness direction is as figure 2 , where B 4 C layer thickness is 40-60mm, SiC layer thickness is 20-30mm, B 4 The gradient layer thickness between C and SiC is 20-30mm. SEM analysis showed that: Surface B 4 Layer C is denser and has no obvious holes, such as Figure 7 . The mechanical performance test shows that: the surface layer B 4 The hardness of layer C is 32-35GPa, and the bending strength is 550-600MPa. The detailed data are shown in Table 1.

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Abstract

B4C is a preferred material used for vehicle armor through the advantages of high rigidity and light weight, but boron carbide generates decrystallizatoin weakening anti-bullet property under the action of high speed and shock pressure. B4C / SiC functional gradient material is prepared through hot pressed sintering under the condition of 1700-2100 DEG C and 25-40 MPa by taking the following eutectic composite powders by mole percent: 10%-30% of VC (or VN) / 40%-60% of the B4C / 20%-35% of SiC, or 8%-35% of VB2 / 33%-52% of B4C / 25%-41% of SiC, or 5%-25% of VC (or VN) / 35%-60% of B4C / 5%-20% of LaB6 / 30%-55% of SiC, or 5%-25% of VB2 / 35%-55% of B4C / 5%-20% of LaB6 / 30%-50% of SiC as additives. The B4C / SiC functional gradient bullet resistant material has the rigidity of32-36 GPa and the bending strength of 450-700 MPa and reduces the weakening of the anti-bullet property, which is caused by the phase transition of a B4C crystal structure under the action of the shock pressure; in addition, the B4C / SiC functional gradient bullet resistant material has the advantages of both SiC and B4C, and various indexes reach the requirements for the use of the vehicle armor.

Description

technical field [0001] The present invention relates to B 4 Development of C / SiC Bulletproof Ceramic Material. use B 4 The structural form of C / SiC functionally graded ceramics makes the material both SiC and B 4 Advantages of C, suitable for vehicle armor. Background technique [0002] In modern warfare, bulletproof armor materials are indispensable for survival and one of the key technologies of military weapons [1] . Ceramic material has the characteristics of high hardness and light weight, and is one of the excellent anti-ballistic materials [2-3] . Typical ceramics used in armor systems include oxide ceramics (such as Al 2 o 3 ) and non-oxide ceramics (such as B 4 C, SiC and TiB 2 Wait) [4-5] . In general, non-oxide ceramics have higher physical properties and relatively low density (except TiB 2 base ceramics), as a bulletproof material than Al 2 o 3 Ceramic is more favorable. Boron carbide has excellent physical and chemical properties such as extreme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622F41H5/02
Inventor 李汶军李根法
Owner 李汶军